Which of the Following Statements About the Structure of Microtubules

question 8

Multiple Choice

Which of the following statements about the structure of microtubules is FALSE?

• A)Microtubules are built from protofilaments that come together to make a hollow structure.
• B)The two ends of a protofilament are chemically distinct, with α-tubulin exposed at one end and β-tubulin exposed at the other end.
• C)Within a microtubule, all protofilaments are arranged in the same orientation, giving the microtubule structural polarity.
• D)α-Tubulin and β-tubulin are covalently bound to make the tubulin dimer that then assembles into protofilaments.

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